n | a(n) |
---|---|
4 | 1 |
5 | 40 |
6 | 350 |
7 | 3080 |
8 | 17129 |
9 | 82488 |
10 | 464650 |
11 | 1901680 |
12 | 8357426 |
13 | 35701952 |
14 | 159721016 |
15 | 627687060 |
16 | 2642405289 |
17 | 10712590392 |
18 | 45568675202 |
19 | 178738923440 |
20 | 736145997686 |
21 | 2946913512648 |
22 | 12311241803256 |
23 | 48275516469180 |
24 | 197284995875314 |
25 | 786939537437440 |
26 | 3254422571085400 |
[1,40,350,3080,17129,82488,464650,1901680,8357426, 35701952,159721016,627687060,2642405289, 10712590392,45568675202,178738923440,736145997686, 2946913512648,12311241803256,48275516469180, 197284995875314,786939537437440,3254422571085400] |